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Quantum phase transitions in matrix product systems
Michael M. Wolf, Gerardo Ortiz, Frank Verstraete +1
We investigate quantum phase transitions (QPTs) in spin chain systems characterized by local Hamiltonians with matrix product ground states. We show how to theoretically engineer s…
Efficient quantum memory and entanglement between light and an atomic ensemble using magnetic fields
Christine A. Muschik, Klemens Hammerer, Eugene S. Polzik +1
We present two protocols, one for the storage of light in an atomic ensemble and the subsequent retrieval, and another one for the generation of entanglement between light and atom…
Teleportation and spin squeezing utilizing multimode entanglement of light with atoms
K. Hammerer, E. S. Polzik, J. I. Cirac
We present a protocol for the teleportation of the quantum state of a pulse of light onto the collective spin state of an atomic ensemble. The entangled state of light and atoms em…
Unconditional two-mode squeezing of separated atomic ensembles
A. S. Parkins, E. Solano, J. I. Cirac
We propose schemes for the unconditional preparation of a two-mode squeezed state of effective bosonic modes realized in a pair of atomic ensembles interacting collectively with op…
Effective Spin Quantum Phases in Systems of Trapped Ions
X. -L. Deng, D. Porras, J. I. Cirac
A system of trapped ions under the action of off--resonant standing--waves can be used to simulate a variety of quantum spin models. In this work, we describe theoretically quantum…
Mapping local Hamiltonians of fermions to local Hamiltonians of spins
F. Verstraete, J. I. Cirac
We show how to map local fermionic problems onto local spin problems on a lattice in any dimension. The main idea is to introduce auxiliary degrees of freedom, represented by Major…